The anomalous stock market behavior of small firms in January

Abstract

Small firms experience large returns in January and exceptionally large returns during the first few trading days of January. The empirical tests indicate that the abnormally high returns witnessed at the very beginning of January appear to be consistent with tax-loss selling. However, tax-loss selling cannot explain the entire January seasonal effect. The small firms least likely to be sold for tax reasons (prior year ‘winners’) also exhibit large average January returns, although not unusually large returns during the first few days of January.